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- W2012101070 abstract "A two-step method for the selection of transformants of prototrophic industrial strains of the methylotrophic yeast Pichia pastoris has been developed. This method is based on our observation that P. pastoris cannot use sucrose as the sole carbon source (Suc−) and that introduction of the invertase gene (SUC2) of Saccharomyces cerevisiae renders P. pastoris Suc+. P. pastoris was transformed with a plasmid which contains the SUC2 gene of S. cerevisiae and an autonomously replicating sequence PARS1 from P. pastoris. The transformants were initially allowed to regenerate on medium containing dextrose and the regenerated cells were pooled and plated on sucrose medium to screen for Suc+ transformants. It was shown that the Suc+ transformants of P. pastoris with the autonomously replicating plasmid were highly unstable with respect to the plasmid maintenance, even when grown on sucrose as the sole carbon and energy source. This high instability was attributed to an efficient cross-feeding by Suc− segregants on glucose and fructose generated due to hydrolysis of sucrose by the invertase enzyme secreted by Suc+ cells. Spontaneous integration of the plasmid DNA resulting in a stable Suc+ phenotype was also observed. However, stable Suc+ transformants were obtained more readily by integration of SUC2 into P. pastoris genome following transformation with a linearized plasmid with the ends homologous to P. pastoris HIS4 locus. All such integrants were completely stable for Suc+ phenotype after 20 generations of growth in a nonselective medium." @default.
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- W2012101070 date "1987-01-01" @default.
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- W2012101070 title "Invertase gene (SUC2) of Saccharomyces cerevisiae as a dominant marker for transformation of Pichia pastoris" @default.
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- W2012101070 doi "https://doi.org/10.1016/0378-1119(87)90272-1" @default.
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